Cut the Cord From RV Parks!
This solution will generate enough electricity to keep your batteries charged all day while still running lights, fans, water pump, laptops, and other 12V devices.
Your batteries will have enough charge to run your furnace all night long (assuming you have an adequate battery bank).
It will generate enough power for small inverters, allowing you to run C-PAP machines and televisions.
Give your generator a break, and save money on gasoline.